The S&P 500 measures the performance of Large Cap securities and is selected by a Committee process. Currently, 15 ETFs track the S&P 500 with more than $537.83 B in ETP assets with an average expense ratio of 0.71%. The largest ETF is SPDR S&P 500 ETF Trust (SPY) by SPDR with $278.42 B in assets.
In the last 12 months, the best performing S&P 500 ETF was the ProShares UltraPro S&P500 (UPRO) at 54.19%. The most-recent ETF launched by S&P 500 was the Direxion Daily S&P 500 Bear 1X Shares (SPDN) in June 2016.